Method for providing service for security of web-browser-based content

A method for providing a service for security of a web-browser-based content of a service providing system that distributes an HTML-based original content to a web browser of a user terminal, the service providing method comprising:

• a character setting step of creating and storing one or more garbage character based on a plurality of original characters constituting an original content;
• a content processing step of creating a security content obfuscating the original content by inserting one or more garbage characters, which are randomly selected from a plurality of pre-stored garbage characters, into the original content;
• a security processing step of creating a security module that calls one or more functions for restoring the security content into the original content of APIs provided by a web browser, of creating, encoding, and inserting credential information, in which hash information and a function name for each of one or more callers included in a custom module are matched and included through the security module when creating the custom module including the one or more callers that call the API-based system function, in order to perform one or more functions related to the original content, and of inserting the security module and the custom module into the security content;
• and
• a distributing step of creating function recognition information for a caller that is not a caller defined in advance in the security module of callers that call the system function on the web browser by hooking an API of the web browser, and then of setting the security module into a distribution mode and then transmitting the security content to the web browser in order to operate the security module such that a caller corresponding to the function recognition information is allowed to call a system function when credential information coinciding with the function recognition information exists in the custom module.